Work

Multi-trait selection in multi-environments for performance and stability in cassava genotypes

Year: 2023

Type: article

Abstract: Genotype-environment interaction (GEI) presents challenges when aiming to select optimal cassava genotypes, often due to biased genetic estimates. Various strategies have been proposed to address the need for simultaneous improvements in multiple traits, while accounting for performance and yield stability. Among these methods are mean performance and stability (MPS) and the multi-trait mean performance and stability index (MTMPS), both utilizing linear mixed models. This study’s objective was to assess genetic variation and GEI effects on fresh root yield (FRY), along with three primary and three secondary traits. A comprehensive evaluation of 22 genotypes was conducted using a randomized complete block design with three replicates across 47 distinct environments (year x location) in Brazil. The broad-sense heritability ( H2 ) averaged 0.37 for primary traits and 0.44 for secondary traits, with plot-based heritability ( hmɡ2) consistently exceeding 0.90 for all traits. The high extent of GEI variance ( σɡxe2 ) demonstrates the GEI effect on the expression of these traits. The dominant analytic factor (FA3 ) accounted for over 85% of the total variance, and the communality (ɧ) surpassed 87% for all traits. These values collectively suggest a substantial capacity for genetic variance explanation. In Cluster 1, composed of remarkably productive and stable genotypes for primary traits, genotypes BRS Novo Horizonte and BR11-34-69 emerged as prime candidates for FRY enhancement, while BRS Novo Horizonte and BR12-107-002 were indicated for optimizing dry matter content. Moreover, MTMPS, employing a selection intensity of 30%, identified seven genotypes distinguished by heightened stability. This selection encompassed innovative genotypes chosen based on regression variance index ( Sdi2 , R2 , and RMSE) considerations for multiple traits. In essence, incorporating methodologies that account for stability and productive performance can significantly bolster the credibility of recommendations for novel cassava cultivars.

Source: Frontiers in Plant Science

DOI: 10.3389/fpls.2023.1282221

Authors: Juraci Souza Sampaio Filho, Tiago Olivoto, Marcos de Souza Campos, Eder Jorge de Oliveira

Institutions: Universidade Federal do Recôncavo da Bahia, Universidade Federal de Santa Catarina, Embrapa, Embrapa Mandioca e Fruticultura

Language: English

Topic: Genetics and Plant Breeding

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Zero hunger

Open Access status: gold

Estimated APC paid: $3,250